当地球在太空岩石的撞击作用下形成的时候,撞击产生的热量和行星越来越大的重力能量使整个行星融化,甚至包括表面。当时存在的任何水分都会蒸发并消失在太空。然而,当行星接近现在的大小的时候,它的重力强到了足以保持其周围的气体和水蒸气来形成大气层。由于彗星主要是由冻结的水和气体组成的冰,撞击地球的彗星将会蒸发。产生的水蒸气将被留在大气层,最终以降雨的形式落在地球已冷却而且坚硬的表面。因此,地球海洋的水分一定是来自彗星。
Step one: Readingthe passage.
The major destination in this part is to distinguishwhich is the reality and which is the reasoning during it.
Because I guess our biggestproblem in the tough Arguments topics are similar-we even do not know themeaning of Chinese, how can I examine if the evidence is correct or incorrect?
That is really insteresting.At the beginnning, I had discussed this topic ever with a friend who learningin physics. He appreciated me to read something articles about the earth originating. As he said, we have no choice, orwe would have no basical standard to judge whether those sentences are genuineor not.
Furthermore, thereare two major problems we had to solve--how the earth birthand whether it generated the water in this processat the end. I fundementally refered to this website to read the data ofthem, the link is following:
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